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500 个结果
  • 简介:Time-to-DigitalConverter(TDC)isakeyblockusedasthephase/frequencydetectorinanAll-DigitalPhase-LockedLoop(ADPLL).Usually,itoccupiesalargeproportionofADPLL'stotalpowerconsumptionuptoabout30%to40%.Inthispaper,thedetailedpowerconsumptionofdifferentcomponentsintheTDCisanalyzed.APowerManagementBlock(PMB)ispresentedfortheTDCtoreduceitspowerconsumption.A24-bitsTDCcorewiththeproposedPMBisimplementedinHJTC0.18μmCMOStechnology.Simulationresultsshowthatupto84%powerreductionisachievedusingourproposedtechnique.

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  • 简介:Objective:Todetectthemodulationofcytokinesproductionbyacutepromyelocyticleukemia(APL)cellsbeforeorafterexposuretoall-transretinoicacid(ATRA).Methods:DiagnoseswereperformedaccordingtotheFABcytologicalclassificationcriteriaandcytogeneticcriteria.BonemarroworbloodsamplesfromAPLpatientswerecollectedinheparinizedmicrofugetube.PrimaryAPLcellswereseparatedandpurifiedbytraditionalFicoll-Hypaquedensitycentrifugationandenrichedafteradherencetoplasticsurfaces.IL-1(,IL-6,IL-8,TNF(andG-CSFlevelsinthesupernatantsofculturedleukemiacellswereestimatedbyELISAmethod.NBTmethodwasusedtodetectthedifferentiationofAPLcellsatthesametime.Results:96hafterexposuretoATRAat10-6Minvitroor60mg/dayinvivo,APLcellsshowedasignificantincreaseofIL-1((P<0.05)andG-CSF(P<0.05)production,andasignificantdecreaseofIL-6(P<0.05)andIL-8(P<0.05),however,therewasnoobviousvariationofTNF(.Ontheotherhand,theproliferationofAPLcellsinvitrowasstatisticallycorrelatedtotheIL-1(secretionorG-CSFsecretion.AndthecellnumberratioinpatientswithdetectableIL-1(orG-CSFwashigherthanthatwithoutdetectableIL-1(orG-CSF.Conclusion:IL-1(andG-CSFsecretionmayplayanimportantroleintheproliferationofAPLcellsafterexposuretoATRA.

  • 标签: 急性前髓细胞性白血病 全顺式维甲酸 治疗 病人 细胞因子分泌
  • 简介:Wehavestudiedaswitchablehyperbolicmetamaterialcomposedofagraphene–dielectricperiodicstructure.Bytuningthechemicalpotentialofallgraphenesheetssimultaneously,theisofrequencycurvecanswitchbetweenanellipseandahyperbolaconveniently.Inparticular,aspecialhyperbolicisofrequencycurvewithitsasymptoteperpendiculartotheinterfaceisobtainedandusedtorealizethezeroreflectioneffect.Furthermore,azeroreflection-basedopticalswitchworkingintheterahertzspectrumisdemonstrated.Itsbandwidthcanbeefficientlyadjustedbygeometricparameterssuchaspermittivityandperiod.Suchanopticalswitchpossessesthemeritsoflowloss,hightransmittancecontrast,highresponsespeed,compactsize,hightoleranceofchemicalpotential,andhavingallincidentangles(0°–90°)simultaneously.Suchanopticalswitchholdsgreatpotentialinmanyfields,suchasdatastorage,beamsteering,andintegratedphotoniccircuits.

  • 标签: optical switch response compact can ITS
  • 简介:AlowjitterAll-DigitalPhase-LockedLoop(ADPLL)usedasaclockgeneratorisdesigned.TheDigital-ControlledOscillator(DCO)forthisADPLLisaseven-stageringoscillatorwiththedelayofeachstagechangeable.BasedontheImpulseSensitivityFunction(ISF)analysis,aneffectivewayisproposedtoreducetheADPLL'sjitterbythecarefuldesignofthesizesoftheinvertersusedintheDCOwithasimplearchitectureotherthanacomplexone.TheADPLLisimplementedina0.18μmCMOSprocesswith1.8Vsupplyvoltage,occupies0.046mm2ofon-chiparea.Accordingtothemeasuredresults,theADPLLcanoperatefrom108MHzto304MHz,andthepeak-to-peakjitteris139pswhentheDCO'soutputfrequencyis188MHz.

  • 标签: 全数字锁相环 数字控制振荡器 脉冲灵敏度函数 热噪声 速度偏差
  • 简介:SincethereformandopeningupofChina,theCommunistPartyofChinahasbeencommittedtothecontinuousdevelopmentofhumanrightstheoryandtheprotectionofhumanrightsthroughlegalconstruction,inordertopromotethedevelopmentofChina’shumanrightscause.Theprincipleof'respectingandprotecting

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  • 简介:Asakindoftwo-dimensionaltransitionmetaldichalcogenidematerial,tungstendiselenide(WSe2)hasattractedincreasingattention,owingtoitsgappedelectronicstructure,relativelyhighcarriermobility,andvalleypseudospin,allofwhichshowitsvaluablenonlinearopticalproperties.TherearefewstudiesonthenonlinearopticalpropertiesofWSe2andcorrelationwithitselectronicstructure.Inthispaper,theeffectsofspatialself-phasemodulation(SSPM)anddistortioninfluenceofWSe2ethanolsuspensionsaresystematicallystudied,namely,thenonlinearrefractiveindexandthird-ordernonlinearopticaleffect.WeobtainedtheWSe2dispersionsSSPMdistortionformationmechanism,andthroughit,wecalculatedthenonlinearrefractiveindexn2,nonlinearsusceptibilityχ3,andtheirwavelengthdependenceundertheexcitationof457nm,532nm,and671nmlasers.Moreover,byuseofitsstrongandbroadbandnonlinearopticalresponse,all-opticalswitchingoftwodifferentlaserbeamsduetospatialcross-phasemodulationhasbeenrealizedexperimentally.Ourresultsareusefulforfutureopticaldevices,suchasall-opticalswitchingandall-opticalinformationconversion.

  • 标签: TUNGSTEN DISELENIDE NONLINEAR ALL-OPTICAL switching
  • 简介:通过对塞缪尔·巴特勒的TheWayofAllFlesh前四章的翻译,以黄雨石老师的译文作为参考对象,将自己的译文和黄雨石的译文进行对比分析,从中总结出了一些对翻译实践具有指导意义的经验,在文学翻译中,必须坚持忠实和通顺的翻译标准,对不同译文在遇到相同的问题时必须采用不同的策略。

  • 标签: 作品 翻译标准 译文
  • 简介:All-opticalswitchinghasbeentheoreticallyanalyzedinthe3,3'-diethyl-2,2'-thiatricarbocyanineiodide(DTTCI)carbocyaninedyethatexhibitslargeexcited-stateabsorptiontoachievehighcontrastandfastswitching.Switchinghasbeenanalyzedbothnsandpspumppulsewidths.Itisshownthatthereisanoptimumvalueofconcentrationforgivenpeakpumpintensityatwhichmaximummodulationcanbeachieved.Wecanget93.84%modulationoftransmissionofaCWprobelaserbeamat532nmatpeakpumpingintensityof500kW/cm2at763nm,with?t=1nsandconcentrationof80μMinalcohol,resultinginswitch-offandontimeof2nsand8ns,respectively.Theresultshavebeenalsousedtodesignall-opticalNOTandtheuniversalNORandNANDlogicgateswithmultiplepumplaserpulses.

  • 标签: 全光开关 激发态吸收 激光束传输 快速切换 高对比度 脉冲宽度
  • 简介:床负担的数量是在沉积运输研究的一个重要物理参数。在床负担测量瞄准困难,这篇论文开发一个装底部的监视器由采用沉积坑方法并且解决象称和desilting的如此的关键问题测量床负担运输率,它能完成长期,平凡的河,河口和海岸的床负担运输率的全天候、即时的telemeasurement。实验室和这个监视器是合理的在的领域测试表演设计,在性质稳定、方便在里面测量,和它能被用来在实际工程监视床负担运输率。

  • 标签: 安装 底部 实时 开发 监控器 全天候
  • 简介:Wepresenthereaseriesofperylenediimide(PDI)basedisomericconjugatedpolymersfortheapplicationasefficientelectronacceptorsinall-polymersolarcells(all-PSCs).BycopolymerizingPDImonomerswith1,4-diethynylbenzene(para-linkage)and1,3-diethynylbenzene(meta-linkage),isomericPDIbasedconjugatedpolymerswithparallelandnon-parallelPDIunitsinsidebackboneswereobtained.Itwasfoundthatpara-linkedconjugatedpolymer(PA)showedbettersolubility,strongerπ-πstacking,morefavorableblendmorphology,andbetterphotovoltaicperformancethanthoseofmeta-linkedconjugatedpolymers(PM)did.DevicebasedonPTB7-Th:PA(PTB7-Th:poly{4,8-bis[5-(2-ethylhexyl)-thiophen-2-yl]benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)-carbonyl]thieno[3,4-b]thiophene-4,6-diyl})showedsignificantlyenhancedphotovoltaicperformancethanthatofPTB7-Th:MA(3.29%versus0.92%).Moreover,thephotovoltaicperformanceofthesepolymericacceptorscouldbefurtherimprovedviaaterpolymericstrategy.Bycopolymerizingasmallamountofmeta-linkagesintoPA,theoptimizedterpolymericacceptorsenabledtoenhancephotovoltaicperformancewithimprovedtheshort-circuitcurrentdensity(Jsc)andfillfactor(FF),resultinginanimprovedpowerconversionefficiency(PCE)of4.03%.

  • 标签: Isomeric CONJUGATED polymers All-polymer solar cells
  • 简介:Anoptimalpowerdistributionanalysisforanall-opticalsamplingorthagonalfrequencydivisionmultiplexing(OFDM)schemewithmultiplemodulationformatsincludingdiferentialphaseshiftkeyed(DPSK),diferentialquadraturephaseshiftkeyed(DQPSK),andnon-return-to-zero(NRZ)isproposed.Thenoisetolerancesofdifferentmodulationformatsareanalyzed,andtheoptimalinputpowerratiobetweenphaseandintensitymodulationformatsforthebestoverallreceivingperformanceisinvestigatedunderunchangedtotalinputpower.Moreover,thisschemecanseamlesslycoexistwiththetraditionalWDMchannel.

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  • 简介:Inpastyears,rare-earth-dopedfluoridefiberlasers(FFLs)havedevelopedrapidlyinthemid-infrared(mid-IR)region.However,duetothelackoffiberopticdevicesandchallengeoffluoridefibersplicing,mostmid-IRFFLshavebeendemonstratedwithfree-spaceopticelements,limitingtheadvantagesofall-fiberlasersforflexibledelivery,stability,andcompactness.Here,wereport,tothebestofourknowledge,thefirstpulsedall-fiberFFLinthemid-IRregion.Bytakingadvantageoftheintegrationofblackphosphorusflake,stableQ-switchedandmode-lockedpulseswereobtainedat2.8μmwavelength.Webelievethatthisall-fiberdesignwillpromotetheapplicationofpulsedFFLinthemid-IRregion.

  • 标签: ALL-FIBER Q-SWITCHED rare-earth-doped FLUORIDE fiber lasers
  • 简介:All-opticalwavelengthconvertersareexpectedtobecomekeycomponentsinthefuturebroadbandnetworks.Hereatwo-segmentDFBlaserforthefirsttimeisusedasanall-opticalwavelengthconverter.Usingthislaser,all-opticalwavelengthconversionfrom1.3μmtp1.55μmisdemonstrated。

  • 标签: 全光波长转换 半导体激光 DFB激光器 宽带网 光波网络
  • 简介:Accordingtothegoodchargetransportingpropertyofperovskite,wedesignandsimulateap–i–n-typeall-perovskitesolarcellbyusingone-dimensionaldevicesimulator.Theperovskitechargetransportinglayersandtheperovskiteabsorberconstitutetheall-perovskitecell.Bymodulatingthecellparameters,suchaslayerthicknessvalues,dopingconcentrationsandenergybandsofn-,i-,andp-typeperovskitelayers,theall-perovskitesolarcellobtainsahighpowerconversionefficiencyof25.84%.Thebandmatchedcellshowsappreciablyimprovedperformancewithwidenabsorptionspectrumandloweredrecombinationrate,soweobtainahighJ_(sc)of32.47mA/cm~2.Thesmallseriesresistanceoftheall-perovskitesolarcellalsobenefitsthehighJ_(sc).Thesimulationprovidesanovelthoughtofdesigningperovskitesolarcellswithsimpleproducingprocess,lowproductioncostandhighefficientstructuretosolvetheenergyproblem.

  • 标签: 高效太阳能电池 钙钛矿型 仿真设计 n型 模拟器设计 P型